反应详情

To a slurry of 3-bromo-6-nitro-1-(phenylsulfonyl)-1H-indole (2.80 g, 7.35 mmol) in ethanol (73.5 mL) was added a solution of tin (II) chloride monohydrate (6.63 g, 29.4 mmol) in water (11.0 mL) at 30° C. Once the addition was complete, the reaction was heated to reflux for 3.5 h, then quenched with 2.0 N sodium hydroxide to a pH of 8. The remaining slurry was diluted with ethyl acetate (100 mL), and the aqueous layer was removed and filtered. The organic phase was washed with 2.0 N sodium hydroxide (2×100 mL), and the combined aqueous layers were extracted with ethyl acetate (3×200 mL). The combined organic phases were concentrated to give a tacky, orange solid for 3-bromo-1-(phenylsulfonyl)-1H-indol-6-amine (2.35 g, 6.69 mmol, 91%).

1. additionOnce the addition
2. temperaturethe reaction was heated
3. temperatureto reflux for 3.5 h
4. customquenched with 2.0 N sodium hydroxide to a pH of 8
5. additionThe remaining slurry was diluted with ethyl acetate (100 mL)
6. customthe aqueous layer was removed
7. filtrationfiltered
8. washThe organic phase was washed with 2.0 N sodium hydroxide (2×100 mL)
9. extractionthe combined aqueous layers were extracted with ethyl acetate (3×200 mL)
10. concentrationThe combined organic phases were concentrated